How much cerebrospinal fluid (CSF) should be collected during a lumbar puncture (LP)?

Updated: Aug 02, 2018
  • Author: Gil Z Shlamovitz, MD, FACEP; Chief Editor: Helmi L Lutsep, MD  more...
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Collect at least 10 drops of cerebrospinal fluid (CSF) in each of the 4 plastic tubes, starting with tube 1. If possible, the CSF that is in the manometer should be used for tube 1. If the CSF flow is too slow, ask the patient to cough or bear down (as in the Valsalva maneuver), or ask an assistant to press intermittently on the patient’s abdomen to increase the flow. Alternatively, the needle can be rotated 90° so that the bevel faces cephalad.

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